单项选择题

The （） of freedom is eternal vigilance (警惕).

A．cost
B．value
C．expense
D．prize

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单项选择题

To do a task promptly is better than （） about it.

A．worry
B．to worry
C．worried
D．worrying

单项选择题

（） from space, our earth, with water covering 70% of its surface, appears as a blue planet

A．Seeing
B．To be seen
C．Seen
D．Having seen

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